Atiku Abubakar and Muhammadu Buhari shake hands at the Peace Accord
They shook hands at the prompting of former President of Liberia, Ellen Johnson-Sirleaf, who is leading the ECOWAS observer mission.
Meanwhile, President Buhari has urged fellow presidential candidates in the coming elections to commit to the final outcome as announced by the Independent Electoral Commission (INEC).
In the same vain, Atiku has said like former President Goodluck Jonathan, his ambition is not worth the blood of any Nigerian.
Patricia Scotland, the secretary-general of the Commonwealth; Mathew Kukah, Bishop of the Roman Catholic Diocese of Sokoto, as well as other members of the National Peace Committee (NPC), are in attendance.
Yakubu Gowon, former head of state, is also present at the ICC to witness the historic event.
Speaking at the event, Atiku said the Nigerian democracy has matured over the years, with the support of the international committee.
She called on all parties involved to ensure peaceful, free, fair, and credible election in Nigeria.
Bill Clinton, former US president, had pulled out of the accord, following the cancellation of his visit to Nigeria less than 48 hours to the event.